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  my $sanity;
while(1){ 
...
  $sanity++; 
  if($sanity > 60){ return(0); }
  }

while(1){
select(undef, undef, undef, 0.5); # .5 second wait
...
if($usizer eq $sizer){ last; } # did it grow at all?
$sizer = $usizer; # set size for next round
}